The more I think about it....

[failedALIAS]

On one side you save your own life and get to return to your beloved sister, whom I believe would have only gotten worse had Daniel disappeared. On the other you kinda save an already tormented man to live the rest of how ever god long that thing lasts as a fucking head. Though I would probably have gone with the first, but if I was told that Winchester (whoever the guy's name was) would be able to help me in some magical way then maybe.